34results about How to "High shape selectivity" patented technology

The invention provides a nonmetal modified catalyst, which is obtained by chemically modifying a ZSM-5 molecular sieve with a nonmetal, wherein the nonmetal is phosphorus, boron or silicon; the mass ratio of the nonmetal to the ZSM-5 molecular sieve is (0.1 to 10):100. The nonmetal modified catalyst can be used for catalyzing conversion of methanol for preparation of p-xylene and coproduction of gasoline and light olefin. An experimental result of the embodiment shows that the nonmetal modified catalyst can be used for successfully catalyzing conversion of the methanol and the conversion rate of the methanol is 97.9 to 99.8 percent; reaction products comprise the p-xylene as well as the gasoline and the light olefin. In addition, the catalyst has high selectivity for both xylene and the p-xylene, the selectivity of the xylene in an obtained olefin substance is 73.6 to 86.8 percent, and the selectivity of the p-xylene in a xylene product is 41.4 to 95.7 percent.

The invention relates to a method for nathphalene alkylation, and mainly aims to solve the problems of relatively poor catalyst selectivity and high inactivation in the prior art. The method comprises the following steps: a), adopting a silicon source, an aluminum source and an organic amine template as raw materials, carrying out hydrothermal crystallization and deionized water washing in sequence to obtain a zeolite precursor material; b), conducting ion exchange on the obtained zeolite precursor material for modification, calcining the modified material to obtain a nathphalene alkylation catalyst; c) applying the nathphalene alkylation catalyst to a nathphalene alkylation reaction, wherein ions adopted for ion exchange are at least one of alkaline-earth metal ions and lanthanum metal ions. The method has the advantages that the problem of relatively poor catalyst selectivity in the prior art is solved relatively well, and the suitability to industrial production of nathphalene alkylation is very high.

The invention relates to a preparation method for a boric-acid-modified microporous molecular sieve shape-selective catalyst. The method comprises: taking a microporous molecular sieve ZSM-5 or MCM-22 as a matrix, taking boric acid as a boron oxide precursor, and loading the outer surface of the microporous molecular sieve with boron oxide through mechanical grinding and a solid phase chemical reaction process, wherein the content of boron oxide in the catalyst is 3%-12% by mass of the total catalyst. The obtained catalyst has extremely good shape-selective catalytic performance in a process of synthesizing 1,4-diethylbenzene from ethylenzene through disproportionation, and the preparation method for the catalyst is simple.

The invention relates to a method for preparing propylene and ethylene from alcohol and mainly solves the problems that a catalyst is low in high-temperature hydrothermal stability and can be inactivated quickly in the past reaction process. By the technical scheme that a modified Zeolite Selony Mobil (ZSM) molecular sieve containing silver, copper and gallium metal oxides is taken as a catalyst under the reaction condition that the reaction temperature is 400 to 600 DEG C, the reaction pressure is -0.05 to 1.0MPa, the weight space velocity is 0.2 to 20 h<-1> and the weight ratio of water to raw materials is 0-20, the problems are well solved; and the method can be used for the industrial production of light olefins.

The invention relates to a preparation method of a tungsten oxide modified micro-porous molecular sieve shape-selective catalyst. The method adopts a micro-porous molecular sieve ZSM-5 or MCM-22 as a carrier and ammonium tungstate as a predecessor of tungsten oxide, tungsten oxide is loaded on the external surface of the micro-porous molecular sieve through an immersion technology, and the mass content of tungsten oxide in the catalyst is 3-15%. The catalyst obtained in the invention has a very good shape-selective catalysis performance on the disproportionation process of ethylbenzene, and the preparation method of the catalyst is simple.

The invention discloses a preparation method of a shape-selective catalyst for synthesizing p-methyl phenol, relating to the technical field of high performance catalyst in alkylating process. The preparation method comprises the following steps of: weighing metal nitrate, and adding the same in anhydrous alcohol, wherein the mass ratio of the metal nitrate to the anhydrous alcohol is 1:10; adding a complex ligand after the metal nitrate is completely dissolved, wherein the mol ratio of the complex ligand to the metal ions in the metal nitrate is 1:1 to 3:1, uniformly stirring the mixture through a glass bar, adding a micro-porous molecular sieve therein, adjusting the mass ratio of the metal ions in the metal nitrate to the micro-porous molecular sieve to 1:100 to 1:5, uniformly stirring, soaking at the room temperature for 24 h, and drying the mixture at water bath of 60 DEG C, transferring the mixture in an oven, and drying the same at 120 DEG C for 6 h, roasting the mixture in a muffle furnace, and heating up to 550 DEG C at a speed of 10 DEG C per minute to obtain the shape-selective catalyst. The invention has the advantages of simple preparation method, low cost and high shape selection performance, etc.

The invention relates to a preparation method of a graphene oxide modified shape-selective catalyst with microporous molecular sieves. According to the method, the microporous molecular sieves MCM-22and ZSM-5 serve as matrixes, and graphene oxide is dispersed in the outer surfaces of the microporous molecular sieves according to a liquid-phase ultrasonic dispersion method. The obtained shape-selective catalyst has good shape-selective catalytic performance for the process of synthesizing p-toluene by toluene disproportionation.

The invention relates to a preparation method and an application of a carbon nitride modified microporous molecular sieve shape selection catalyst. The method includes taking microporous molecular sieves MCM-22 and ZSM-5 as basal body; and dispersing carbon nitride on the outer surfaces of the microporous molecular sieves through an ultrasonic dispersion method. The shape selection catalyst has good shape-selective catalytic performance in the process of synthesizing paraxylene by disproportionation of toluene.

The invention relates to a preparation method for a titanium oxide modified microporous molecular sieve shape-selective catalyst. According to the method, titanium oxide is loaded to the outer surface of a microporous molecular sieve through a dipping method by taking the microporous molecular sieve ZSM-5 or MCM-22 as a matrix, taking tetrabutyl titanate as a titanium oxide precursor, and taking methylbenzene as a solvent; and the content of titanium oxide in the catalyst is 5-20% of the total weight of the catalyst. The obtained shape-selective catalyst has very good shape-selective catalysis performance for a process of synthesizing p-xylene by alkylation of methylbenzene and dimethyl carbonate.

The invention discloses a shape-selective catalyst for efficient alkylation of light aromatic hydrocarbon and methanol, and an application method thereof. The shape-selective catalyst comprises a hydrogen-type short-pore mixed crystal molecular sieve with a special morphology, a binder and a modifying aid, wherein the weight percentage of the hydrogen-type short-pore mixed crystal molecular sievewith the special morphology is 60-95 wt%, and the weight percentage of the binder is 5-40 wt%; and the content of the modifying aid is 10-40% of the total weight of the molecular sieve and the binder.The catalyst is used for the alkylation reaction of the light aromatic hydrocarbon and methanol to generate p-xylene. Compared with catalysts in the prior art, the catalyst of the invention, which isthe short-pore shape-selective catalyst, has the advantages of high selectivity to p-xylene, high methanol alkylation efficiency, long service life, effectiveness in improvement of the light aromatichydrocarbon conversion rate, the methanol utilization rate and the p-xylene yield, reduction of the catalyst regeneration and replacement frequency, and substantial improvement of the technical economical property of the synthesis route.

The invention relates to a preparation method of a melem modified micro-porous molecular sieve shape-selective catalyst. According to the method, a micro-porous molecular sieve MCM-22 and a ZSM-5 serve as substrates, and melem is dispersed on the outer surface of the micro-porous molecular sieve by a liquid-phase ultrasonic dispersion method. The prepared shape-selective catalyst has excellent shape-selective catalytic performance in p-xylene synthesis process by toluene disproportionation.